왜 break는 앞에 동사처럼 과거형으로 안쓰나요? She was furious when she heard someone throw a rock

왜 break는 앞에 동사처럼 과거형으로 안쓰나요?

She was furious when she heard someone throw a rock at her window and break it.

-------------------

전체구조

주절

She was furious

부사절

[when she heard someone [throw a rock at her window and break it].

​

부사절의 구조

when(접) she(주) / heard(동) someone(목) [ throw a rock at her window and break it](목보).에서

​

[ throw a rock at her window and break it]는 지각동사 heard의 목보역할을 하는 원형부정사구이므로

목보내의 throw와 break는 원형동사 형태를 취합니다.